### Font Weights

If you'd like to customize your values for font weights, use the `theme.fontWeights` section of your theme.

```diffjs
  // theme.js
  export const theme = {
    fontSizes: {
-     hairline: 100,
+     'extra-light': 100,
-     thin: 200,
      light: 300,
      normal: 400,
      medium: 500,
+     semibold: 600,
      bold: 700,
-     extrabold: 800,
+     'extra-bold': 800,
      black: 900,
    },
  }
```

If you don't want to customize it, a set of `fontWeights` is already defined in default theme:

```js
const defaultTheme = {
  // ...
  fontWeights: {
    hairline: '100',
    thin: '200',
    light: '300',
    normal: '400',
    medium: '500',
    semibold: '600',
    bold: '700',
    extrabold: '800',
    black: '900',
  },
}
```
